On Thu, Jun 18, 2020 at 7:18 AM Thomas Gleixner [off-list ref] wrote:

Sasha,

Sasha Levin [off-list ref] writes:

quoted

Changes from v12:
 - Reformat the series to be closer to the reverted codebase for easier
   review.
 - Drop a few of the changes introduced in v8 and v9.

I've pushed the lot out to

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/fsgsbase

Thanks for taking this up!

Is there a plan to deal with:

        /*
         * This function has some ABI oddities.
         *
         * A 32-bit ptracer probably expects that writing FS or GS will change
         * FSBASE or GSBASE respectively.  In the absence of FSGSBASE support,
         * this code indeed has that effect.  When FSGSBASE is added, this
         * will require a special case.
         *
         * For existing 64-bit ptracers, writing FS or GS *also* currently
         * changes the base if the selector is nonzero the next time the task
         * is run.  This behavior may? not be needed, and trying to preserve it
         * when FSGSBASE is added would be complicated at best.
         */

in arch/x86/kernel/ptrace.c?